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37 lines
1.0 KiB
37 lines
1.0 KiB
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule getUnboundedScrollPosition |
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* @typechecks |
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*/ |
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'use strict'; |
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/** |
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* Gets the scroll position of the supplied element or window. |
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* |
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* The return values are unbounded, unlike `getScrollPosition`. This means they |
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* may be negative or exceed the element boundaries (which is possible using |
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* inertial scrolling). |
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* |
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* @param {DOMWindow|DOMElement} scrollable |
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* @return {object} Map with `x` and `y` keys. |
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*/ |
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function getUnboundedScrollPosition(scrollable) { |
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if (scrollable.Window && scrollable instanceof scrollable.Window) { |
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return { |
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x: scrollable.pageXOffset || scrollable.document.documentElement.scrollLeft, |
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y: scrollable.pageYOffset || scrollable.document.documentElement.scrollTop |
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}; |
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} |
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return { |
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x: scrollable.scrollLeft, |
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y: scrollable.scrollTop |
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}; |
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} |
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module.exports = getUnboundedScrollPosition; |